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Note 3 - Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 shares | Dec. 31, 2021 USD ($)
Number of Operating Segments |  |  | 2 |  |
Short-Term Investments, Total | $ 10.7 |  | $ 10.7 |  | $ 13,900,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 10,000 |  | 10,000 |  | 10,000
Unrecognized Tax Benefits, Ending Balance | $ 0 |  | 0 |  | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  |  | $ 0 |  |
Open Tax Year |  |  | 2018 2019 2020 2021 |  |
Weighted Average Number of Shares Outstanding, Basic, Total (in shares) | shares | 70,356,796 | 69,220,795 | 70,585,590 | 68,286,033 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares | 8,166,380 |  |  | 8,015,193 |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
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